The Accessory Limb Model Regenerative Assay and Its Derivatives

Area of Science:

• Regenerative biology
• Developmental biology
• Amphibian limb regeneration

Background:

• The Accessory Limb Model (ALM) assay, established in 2004, offers a framework for studying limb regeneration.
• It dissects key regenerative processes: wound epithelium formation, neural induction, and blastema cell patterning.

Purpose of the Study:

• To review the historical development and subsequent research utilizing the ALM assay.
• To provide a detailed surgical protocol for the standard ALM procedure.
• To describe adaptations of the ALM surgery for different limb positions.

Main Methods:

• The ALM assay involves deviating a limb nerve into a lateral wound in axolotls.
• Skin grafting from the opposing limb axis is performed at the injury site.

Main Results:

• The ALM assay has been instrumental in dissecting cellular and molecular events in regeneration.
• Studies using the ALM have elucidated mechanisms of wound healing, neural signaling, and positional memory.

Conclusions:

• The ALM remains a valuable tool for investigating the fundamental steps of limb regeneration.
• Detailed surgical protocols enhance the reproducibility and application of the ALM assay across studies.